<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="消息提示的文案"
        type="info"
        show-icon
        center
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!-- tab栏区域 如果想用表单form的话，只能放在tabs外面，因为el-tab-pane只允许作为el-tabs的子节点 -->
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat" width="120px">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的Item项 让它自己渲染 <el-form-item>标签所以写一个然后v-for即可-->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!--复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
              ><el-input v-model="item.attr_vals"></el-input
            ></el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到的后台API地址-->
            <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!--添加商品的按钮-->
            <el-button type="primary" class="btnAdd" @click="addGoods"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" />
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash";
export default {
  data() {
    return {
      // 这个会通过当你点击tab栏时动态把name值传给v-model,进而改变activeIndex值
      activeIndex: "0",
      //添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: "",
        attrs: [],
      },
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请选择商品分类", trigger: "blur" },
        ],
      },
      //商品分类列表
      catelist: [],
      //代表:props的配置项 label你能看到的值，value代表你选中的是谁的值，children代表用哪个实现父子节点嵌套
      cateProps: {
        expandTrigger: "hover",
        label: "cat_name",
        value: "cat_id",
        children: "children",
      },
      //动态参数列表数据
      manyTableData: [],
      //静态参数列表数据
      onlyTableData: [],
      //图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },
      previewPath: "",
      previewVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品列表失败！");
      }
      this.catelist = res.data;
      //   console.log(this.catelist);
    },
    //级联选择器选中项变化，会触发这个函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = [];
      //   console.log(this.addForm.goods_cat);
    },
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类！");
        return false;
      }
    },
    // Tabs Events
    // tab-click	tab 被选中时触发	被选中的标签tab 实例
    async tabClicked() {
      //证明访问的是动态参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数列表失败！");
        }
        // console.log(res.data);
        res.data.forEach((item) => {
          // 这里如果不做三元表达式判断，则如果为空字符串，也会形成一个数组 [""] 相当于 length =1 则会形成一个空白标签，所以要做判断
          item.attr_vals =
            item.attr_vals.length === 0 ? "" : item.attr_vals.split(",");
        });
        this.manyTableData = res.data;
        // console.log(this.manyTableData);
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" },
          }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性失败！");
        }
        // console.log(res.data);
        this.onlyTableData = res.data;
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      // console.log(file);
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    //处理移除图片的操作
    handleRemove(file) {
      //   console.log(file);
      // 1，获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2．从pics数组中，找到这个图片对应的索引值
      //   x代表数组里每一项，（其中每一项都是个对象） 如果匹配上了 则拿到当前索引值 赋值给左边i
      const i = this.addForm.pics.findIndex((x) => x.pic === filePath);
      // 3．调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm);
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
      //   console.log(response);
      // 1．拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };
      // 2．将图片信息对象，push 到pics数组中
      this.addForm.pics.push(picInfo);
      //   console.log(this.addForm);
    },
    addGoods() {
      // console.log(this.addForm);
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return this.$message.error("请填写必要的表单项！");
        //执行添加的业务逻辑

        //lodash  cloneDeep(obj) 这里新用到一个插件 lodash  用来深拷贝一个新对象，来避免数组和字符串冲突 原因是级联选择器用的是数组 而这个客户端后台需要传的是字符串的原因
        const form = _.cloneDeep(this.addForm);
        // this.addForm.goods_cat = this.addForm.goods_cat.join(","); 所以不用这句话了
        form.goods_cat = form.goods_cat.join(",");
        //而且一般就为了这么一个东西下了个插件深拷贝，不太值，这么深拷贝的对象也可以
        // const form = JSON.parse(JSON.stringfy(this.addForm))好吧这句话好像不好使，以后在研究吧，先放这..
        // console.log(form);

        //处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(","),
          };
          this.addForm.attrs.push(newInfo);
        });

        //处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        // console.log(form);

        //发起请求添加商品
        //商品的名称，必须是唯一的
        const { data: res } = await this.$http.post("goods", form);
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败！");
        }
        this.$message.success("添加商品成功！");
        this.$router.push("/goods");
      });
    },
  },

  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>

<style lang="less" scoped>
.el-cascader {
  width: 50%;
}
.el-checkbox {
  margin: 0 10px 0 0;
}
// 自己改了一下，让图片装在盒子里
.el-dialog__body {
  img {
    width: 100%;
  }
}
.btnAdd {
  margin-top: 15px;
}
</style>